#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Copyright © 2014 Dropbox, Inc.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

import sys
import os
import argparse
import json
usage = """Export all messages on a given stream to a JSON dump.

zulip-export --user=<your email address> --api-key=<your api key> --stream=<stream name>

(You can find your API key on your Settings page.)

Example: zulip-export --user=wdaher@zulip.com --api-key=a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5 --stream=social

You can omit --user and --api-key arguments if you have a properly set up ~/.zuliprc
This script requires the Zulip API bindings to be installed."""
sys.path.append(os.path.join(os.path.dirname(__file__), '../../api'))
import zulip

parser = zulip.add_default_arguments(argparse.ArgumentParser(usage=usage))
parser.add_argument('--stream', default='', action="store")
options = parser.parse_args()

client = zulip.init_from_options(options)

if options.stream == "":
    print("Usage:", parser.usage, file=sys.stderr)
    sys.exit(1)

client.add_subscriptions([{"name": options.stream}])
queue = client.register(event_types=['message'])
max_id = queue['max_message_id']
messages = []
request = {
    'anchor': 0,
    'num_before': 0,
    'num_after': max_id,
    'narrow': [{'operator': 'stream',
                'operand': options.stream}],
    'apply_markdown': False,
}

print("Fetching messages...")
result = client.call_endpoint(
    url='messages',
    method='GET',
    request=request,
)

if result['result'] != 'success':
    print("Unfortunately, there was an error fetching some old messages.")
    print(result)
    sys.exit(1)
for msg in result['messages']:
    if msg['type'] != 'stream':
        continue
    # Remove extraneous metadata
    for k in ['flags', 'edit_history', 'subject_links',
              'avatar_url', 'recipient_id', 'sender_short_name',
              'content_type', 'client', 'sender_realm_str', 'id', 'type']:
        msg.pop(k, None)
    messages.append(msg)

filename = "zulip-%s.json" % (options.stream,)
f = open(filename, mode="wb")
f.write(json.dumps(messages, indent=0, sort_keys=False).encode('utf-8'))
f.close()
print("%d messages exported to %s" % (len(messages), filename,))
sys.exit(0)
